Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2016	May. 02, 2015	Apr. 30, 2016	May. 02, 2015
Segment Reporting Information
Net revenues	$ 523,306	$ 546,575	$ 1,097,590	$ 1,122,814
Service	95,113	88,332	188,230	178,333
Cost of revenues	172,995	174,366	358,464	360,922
Gross margin	350,311	372,209	739,126	761,892
Storage Area Networking (“SAN”) Products
Segment Reporting Information
Net revenues	296,627	313,512	643,685	666,911
Cost of revenues	71,972	73,768	153,176	159,493
Gross margin	224,655	239,744	490,509	507,418
IP Networking Products
Segment Reporting Information
Net revenues	131,566	144,731	265,675	277,570
Cost of revenues	60,236	63,844	123,129	128,045
Gross margin	71,330	80,887	142,546	149,525
Global Services
Segment Reporting Information
Net revenues	95,113	88,332	188,230	178,333
Cost of revenues	40,787	36,754	82,159	73,384
Gross margin	$ 54,326	$ 51,578	$ 106,071	$ 104,949